import javax.mail.MessagingException

import org.springframework.mail.MailException
import org.springframework.mail.SimpleMailMessage

/**
 * Simple service for sending emails.
 *
 * Work is planned in the Grails roadmap to implement first-class email
 * support, so there's no point in making this code any more sophisticated.
 *
 * @author Haotian Sun
 */
class EmailerService {
    boolean transactional = false

    static def mailSender
    static def mailMessage // a "prototype" email instance

    /**
     * Send a list of emails.
     *
     * @param mails a list of maps
     */
    def sendEmails(mails) {

        // Build the mail messages
        def messages = []
        for (mail in mails) {
            // create a copy of the default message
            def message = new SimpleMailMessage(mailMessage)
            message.to = mail.to
            message.text = mail.text
            message.subject = mail.subject
            messages << message
        }

        // Send them all together
        try {
            mailSender.send(messages as SimpleMailMessage[])
        }
        catch (MailException e) {
            log.error "Failed to send emails: $e.message", e
        }
        catch (MessagingException e) {
            log.error "Failed to send emails: $e.message", e
        }
    }
}
